Bottle stopper



FIG. 1 is a perspective view of a bottle stopper showing our new design;

FIG. 2 is an elevational view thereof, the bottle stopper having circumferential symmetry;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof. 

CLAIM The ornamental design for a bottle stopper, as shown and described. 